Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 29, NWS Twin Cities, MN

May 10, 2011Polk County, Wisconsin; Chisago County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 10, 2011, 10:43 PM CDT for Polk County, Wisconsin; Chisago County, Minnesota. It was in force for 47 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 10, 2011, 10:43 PM CDT (03:43 UTC)
Expired
May 10, 2011, 11:30 PM CDT
In force
47 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Chisago County, MN, Polk County, WI

The radar

The Minneapolis radar (KMPX), 112 km from the middle of the area, began a volume at 03:45 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
May 10, 10:50 PM CDTHAIL 1.52 Ne North Branch, MN
May 10, 11:14 PM CDTHAIL 0.75North Branch, MN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 10, 5:53 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 3.7 hours before the alert went out and 113 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2011-05-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4330 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2011-05-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 183 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
4330 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
1463 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
183 m²/s²
0-3 km storm-relative helicity
292 m²/s²
Significant tornado parameter
3.0
Supercell composite
33.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

701 
WUUS53 KMPX 110343
SVRMPX
MNC025-WIC095-110430-
/O.NEW.KMPX.SV.W.0029.110511T0343Z-110511T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1043 PM CDT TUE MAY 10 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHERN POLK COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 1130 PM CDT

* AT 1041 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR STACY...OR
  ABOUT 7 MILES SOUTH OF NORTH BRANCH...AND MOVING NORTHEAST AT 30   
  MPH. IN ADDITION...MORE STRONG THUNDERSTORMS WERE DEVELOPING       
  ACROSS CHISAGO COUNTY.

LOCATIONS IN THE WARNING INCLUDE...
  NORTH BRANCH...
  BRANCH...
  HARRIS...
  WOLF CREEK...
  CUSHING...
  CENTURIA...
  MILLTOWN...
  LUCK...
  FREDERIC...
  LEWIS...
  CLAM FALLS...
  INTERSTATE 35...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

REPORT ANY SIGNIFICANT WIND OR HAIL DAMAGE TO THE NEAREST LAW
ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER SERVICE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT WEDNESDAY
MORNING FOR SOUTHEASTERN MINNESOTA.

&&

LAT...LON 4572 9215 4564 9215 4550 9236 4543 9264
      4542 9303 4556 9303 4557 9307 4562 9306
      4566 9288 4565 9287 4565 9255 4571 9255
      4574 9252
TIME...MOT...LOC 0342Z 242DEG 25KT 4542 9301
WIND...HAIL <50MPH 1.00IN

$$
2 follow-up statements
635 
WWUS53 KMPX 110355
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1055 PM CDT TUE MAY 10 2011

MNC025-WIC095-110430-
/O.CON.KMPX.SV.W.0029.000000T0000Z-110511T0430Z/
CHISAGO MN-POLK WI-
1055 PM CDT TUE MAY 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN POLK
AND CENTRAL CHISAGO COUNTIES UNTIL 1130 PM CDT...

AT 1052 PM CDT...TRAINED STORM SPOTTERS REPORTED ONE AND A HALF INCH 
DIAMETER HAIL TWO MILES NORTHEAST OF NORTH BRANCE. NATIONAL WEATHER 
SERVICE RADAR ALSO INDICATED ANOTHER SEVERE THUNDERSTORM CAPABLE OF 
PRODUCING THIS SIZE HAIL TWO MILES SOUTHEAST OF NORTH BRANCH.  THESE 
STORMS WERE MOVING NORTHEAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  HARRIS...WOLF CREEK...CUSHING...MILLTOWN...LUCK...FREDERIC...LEWIS
  AND CLAM FALLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE ROOFS...WINDOWS...SIDING AND VEHICLES. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4572 9215 4564 9215 4550 9236 4543 9264
      4542 9301 4563 9300 4566 9288 4565 9287
      4565 9255 4571 9255 4574 9252
TIME...MOT...LOC 0354Z 215DEG 32KT 4551 9292
WIND...HAIL <50MPH 1.75IN

$$
330 
WWUS53 KMPX 110417
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1117 PM CDT TUE MAY 10 2011

MNC025-WIC095-110430-
/O.CON.KMPX.SV.W.0029.000000T0000Z-110511T0430Z/
CHISAGO MN-POLK WI-
1117 PM CDT TUE MAY 10 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN POLK
AND EAST CENTRAL CHISAGO COUNTIES UNTIL 1130 PM CDT...

AT 1116 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL.  THIS STORM
WAS LOCATED NEAR WOLF CREEK...OR 11 MILES EAST OF NORTH 
BRANCH...MOVING NORTHEAST AT 30 MPH. MORE STRONG THUNDERSTORMS WERE 
DEVELOPING ACROSS CENTRAL TO SOUTHERN CHISAGO COUNTY AND WERE MOVING 
NORTHEAST.

LOCATIONS IMPACTED INCLUDE...
  CUSHING...FREDERIC...LUCK...MILLTOWN...LEWIS AND CLAM FALLS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

&&

LAT...LON 4572 9215 4564 9215 4550 9236 4543 9264
      4543 9284 4564 9279 4565 9255 4571 9255
      4574 9252
TIME...MOT...LOC 0416Z 239DEG 25KT 4558 9273
WIND...HAIL <50MPH 1.25IN

$$

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 10, 9:09 PM CDTSpecial Weather StatementMPXPolk66 min
May 10, 11:28 PM CDTSevere Thunderstorm WarningMPXPolk47 min
May 11, 9:51 AM CDTSpecial Weather StatementMPXChippewa, Dunn, Eau Claire54 min
May 11, 11:01 AM CDTSpecial Weather StatementMPXBarron, Chippewa, Dunn, Eau Claire, Pepin, Rusk74 min
May 11, 11:05 AM CDTSevere Thunderstorm WarningMPXDunn, Pepin40 min
May 11, 12:43 PM CDTSpecial Weather StatementMPXRusk47 min
May 11, 12:50 PM CDTSevere Thunderstorm WarningMPXRusk25 min
May 10, 7:00 PM CDTSevere Thunderstorm WarningMPXFreeborn, Steele60 min
May 10, 7:06 PM CDTSevere Thunderstorm WarningMPXBenton, Mille Lacs, Sherburne39 min
May 10, 7:21 PM CDTSevere Thunderstorm WarningMPXBenton, Morrison54 min
May 10, 7:24 PM CDTSevere Thunderstorm WarningMPXCarver, Dakota, Hennepin, Scott66 min
May 10, 7:43 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin, Isanti, Mille Lacs, Sherburne, Wright62 min
May 10, 7:46 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, Scott59 min
May 10, 7:47 PM CDTSevere Thunderstorm WarningMPXBenton, Mille Lacs58 min
May 10, 7:54 PM CDTSevere Thunderstorm WarningMPXDakota, Rice, Scott53 min
May 10, 7:55 PM CDTTornado WarningMPXAnoka, Hennepin, Sherburne, Wright35 min
May 10, 8:10 PM CDTTornado WarningMPXHennepin35 min
May 10, 8:27 PM CDTSevere Thunderstorm WarningMPXIsanti, Kanabec, Mille Lacs63 min
May 10, 8:44 PM CDTTornado WarningMPXAnoka, Isanti, Sherburne35 min
May 10, 8:51 PM CDTTornado WarningMPXIsanti, Kanabec, Mille Lacs39 min
May 10, 9:19 PM CDTSevere Thunderstorm WarningMPXKanabec41 min
May 10, 9:29 PM CDTSevere Thunderstorm WarningMPXIsanti, Kanabec, Mille Lacs46 min
May 10, 9:31 PM CDTAreal Flood AdvisoryMPXIsanti, Kanabec, Mille Lacs3 hr
May 10, 10:00 PM CDTSevere Thunderstorm WarningMPXIsanti43 min
May 10, 10:03 PM CDTSevere Thunderstorm WarningMPXKanabec36 min
May 10, 10:19 PM CDTSevere Thunderstorm WarningMPXChisago56 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2011Severe Thunderstorm Warnings in Minnesota, 2011Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.